Lifting, turning, and seating device for plug valves



1944- T. F. SYKES, JR 2,364,567

- LIFTING, TURNING, AND SEATING DEVICE FOR PLUG VALVES Filed Oct. 14, 1942 INVENTOR Thomas 5 A13 7},

ATTORNEY Patented Dec. 5,

UNITED STATES PATENT OFFICE IJFTING, TURNING, AND SEATING DEVICE FOR PLUG VALVES Thomas F. Sykes, Jr., Drexel Hill, Pa. Application October-14, 1942, Serial No. 462,056

1 Claim.

My invention is concerned generally with an improved valve mechanism and more specifically with a plug type of valve in which the seal breaking device is uni-controlled.

One of the objects of my invention is to break the seal of a plug valve through the medium of a common control of a cam-lifting and turning device.

Another function of my invention is to provide a plug valve that operates without freezinglike the globe valve.

Furthermore, my invention provides a plug valve with a positive self-seating action.

Other advantages and uses for my novelly designed valve mechanism will become apparent from the appended description of the preferred physical embodiment of my invention in which the drawing carries reference numerals that refer to like parts throughout when repeated.

Referring to the accompanying drawing:

Fig. 1 is a plan view of a plug valve carrying the valve mechanism. Fig. 2 is a sectional view of a plug valve operating mechanism on line 2--2 of Fig. 1. Fig. 3 is a fragmentary, elevational view of part of the valve lifting and tuming mechanism. Fig. 4 is a sectional view taken on line 4-4 of Fig. 1. Fig. 5 is a sectional view taken on line 55 of Fig. 2.

In Figs. 1 and 4, there is represented a valve body or casing containing the valve seat S. The lever I, fabricated of suitable material, is mounted securely into a cam block 2 which consists sub stantially of a hollow cylinder fitting tightly like a collar around the valve stem 4. The lever i turns in a clockwise manner as indicated by the arrow D and rotates the cam block 2 in the same direction. A circular plate 3 is studded to the attenuated end of the stem 4. Arrows A and A" are inscribed on the circular plate 3. In addi-- tion, a groove 1 is cut into the circular plate 3 in order that the flow of fluid can be easily determined. In other words, the arrows A (on the lever I) and A coincide, the groove I indicates the direction of the flow, and when the arrow A coincides with arrow A" then the flow is directed otherwise. Fig. 4 discloses the stem 4,.the plug 5 at the end of the stem 4 and the line BB' in the relationship of a diverted flow from the main line.

Since many parts of the mechanism are conventional, only those parts in which the invention resides are set forth with detailed description. In Fig. 3, the cam block 2 is illustrated withits slots 8 out along its cylindrical surface for a length of 60, the cam portions thereof being at a 1/6 pitch. .Cam slots 8 are positioned 180 apart and constitute the runways for the ends of the pin 9 which is tightly and transversely mounted in the stem 4, as shown in Fig. 4. A threaded nut l0 locks the cam block 2 securely against the valve structure and accepts the thrust developed when the plug is lifted and turned. In Fig. 2, the transverse opening In in the stem 4 accepts the pin 9 in a snug fit. In the upper section of the cam block 2 are mounted two ver-,

tical pins H which penetrate sufficiently beyond the upper surface of slot 8 in block 2 to engage the transverse pin 9. The pins I l wardly against the action of compression of the springs l2 in order to take a retractive position in the drilled openings I 3 in which they act. The collar [4 serves to guide and to restrict the pins to their defined course of action and also to back up spring l2.

Fig. 5 discloses more clearly the relationship of the horizontal pin 9 that moves in the cam slot and the vertical pins ii that are mounted in the upper section of the cam block.

The method of operation of my valve mechanism becomes apparent from the following description. When the lever is rotated clockwise approximately 30, the cam block 2 turning with it causes the pin .9 to rise and the plug 4 'With it, thus breaking the seal. After the plug 4 has risen, the pin 9 then engages with the pins l l and actuates the turning of the plug 4. During the rotation of the plug 4 the pressure on the pins II is resisted by the springs I 2 until the plug 4 reaches its stop, and the cam block 2 continues to turn. Ihus the pressure on the pins ll increases and the pressure of springs I2 is overcome-allowing the pins H to rise and letting the cam block 2 turn, when the valve becomes seated by the pressure of the cam slot 8 on the pin 9. Substantially a movement of 90 is re tional 30 for seating the valve.

At this point arrow A coincides with A".

An identical action turned in the opposite direction back to the original position. Although the aforedescribed device represents the preferred embodiment of my invention, yet it is to be construed as only illustrative and not restrictive of the spirit and the scope of my invention which is further defined in terms of the annexed claim.

I claim:

In a valve mechanism, a casing having fluid passages and a tapered seat intersecting said passages, a tapered plug having ports to cooperate can move up-' with said passages and mounted in said seat for rotation between operative positions and for limited axial movement, means to limit rotation of the plug to said positions, an operating stem extending from said plug, a I sleeve rotatably mounted on said casing and surrounding said stem, a slot in said sleeve, the intermediate portion of said slot being in the direction of a plane normal to the axis of rotation of the sleeve, the

' end portions of said slot being inclined in the direction of the taper toward the smaller end of said plug, a transverse pin in said stem extending into said slot, a spring pressed plunger carried by said sleeve and extending into the intermediate portion of said slot Ina position to be engaged by said pin, and means for rotating said sleeve.

THOMAS F. SYKES, JR. 

